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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a258525d0b2b733a2d76e615e4f4e9be1f9ef776e36a7e84dd0890f5e39e28' 
  AND token = 'DTbRT68fifjAOXw34H7+VZHxnXpRxPZXB5wQVH/JFTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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