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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a034f4ccf686523cae7b294447c7cfb60655127478a9d71efcdb5e077c58f7' 
  AND token = '85fFOFLhlVr4CHL1E0UWfacu6sAv+Wz77tec/Be///A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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