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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362ecb90ee5b5180b548a9df53ff23dbca7aa1af60d31f3c944bb42c8e8cb31a' 
  AND token = '3aFC7SgYnlspV0GbLkYDALAJLJxkHlbjlEkyxRBv7AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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