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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f14e72f68824cd0832f6312182e5dc1e3ce8645ce733654c0b105d21e050e4' 
  AND token = 'XxCILf4gn3YwNl3oRHcCPkkQdCVsVN0Y8451tEQYwH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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