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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4831ca3958c05115bc39c9a5555596a030d652d85adcf10334fda3ac960d7af7' 
  AND token = '8NOmSFd6jrltp6AVMGPX2ZIf4/4GoYgwlT7gjyTyMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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