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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ddca23400d5fa417da9fef62dffff5f4b4954747c8ac02dbf1b415e269f870' 
  AND token = 'ej1egWUuM2vpiIu9TdiDN5Aqh4+BpwdjV3h/EMK2hQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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