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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03090b36e9699bd7e6b713b9a1711bd7e6b2ca171e2c5d33863984f6b471fc13' 
  AND token = 'VD/LF+2AzV3uAXyLTES9YMhCAEROr39vwBAJ3hB4kdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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