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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefa0ca6a07f8ebfbe77d135c08b33e02689fe14039ee5831b9444db3575f4d5' 
  AND token = 'NfQhOoEleAppUCxHOZMr9QGzjBmUyuJzJQ9QR9YVEXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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