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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc48557c4ff1bc804e8642b8fdb7f1ff818711babfe64dc806e94079321333f9' 
  AND token = 'C1VNnraHzgevo31wMaH7uR0GmJOW6jNAnRHReY552Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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