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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd99008ee480d14e4ebcba421e1fadfa9a7b2664ba1d9619065835ed6d65bf57' 
  AND token = 'L9qvBfdID1CqhQSDzPDaQr7S/rxa6iS6QCC8YH6hocI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}