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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8420da6a2aaaf0a335b439f8ae074e24a5ea62236259d336eb478d246bce3794' 
  AND token = '1mLEjq7YEw3ChlohExPbo6Htw7wFJ1VkwfrxlsADHCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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