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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662eaff9bd24dc7c305763418ada56aaf4be8cc15ab92c5a1d5057a37b2697ec' 
  AND token = 'ntZQ6nWOfg/1Dj6JZd6v/FfgbmmzKDr84oRZtAfC8H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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