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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc0b3e9565b1970ca2140b0ba141448407623c4b6f476885c3ad940e519edaa' 
  AND token = 'm/Pu7aX4wNMJFvfEQWl88ToF2XiX9JxG4Ylrt91Wj0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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