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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad4272939984f023d505526f3ecabc5cb28aaa3c876b50236cf8d3f5f86a60c' 
  AND token = '545FaxBXPrWarE9TTVzGMPBTep4LAuo2Kap9cuKi8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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