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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7284759c42b631fb2a45c9bad544201f92174ec35b632a84191d17bcc1024c1' 
  AND token = 'c3TR9xU/GgehncJ9uH306qo5QSQRIXdqg+MsUrH07hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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