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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04279cfa4472ca5a51f372fbf5c9477bb18101e747a06e90592f82811425efa' 
  AND token = 'aF6WUoFex0Ing37Q6qePKYHK7Z80mN1pikQWO3n2PAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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