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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c55e4134c927a9a25ff4fa5826146569e3aa3b1e77d45aca2dc574fd3ca21f5' 
  AND token = '1xjoQHPzoxVMjyiBce/b9AbSrAwp9WySGWAUNSIpI4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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