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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4f8b37a3a5d27e138f9d555cc93d9d76f70116aa7a52947107ef66f79669ed' 
  AND token = 'Ms7Wp78h/3KaJqoPeocgZpyqY9XKhVemjyGpAelIqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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