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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d7df49b7fca720939de032af9f327f54fde2d38e661f044d3fe5b6ff9f8f3e' 
  AND token = 'oYStcmCHc6+6kFJMrnuwPhNX12/TxYDIAUI8elUh4ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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