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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f208e6c17a576866dee37f35e7f479fb9fe8f9b891445ce2d40da74286c1311f' 
  AND token = 'jXZmJyNU+diOMWlhGM9oEJ7iy9UISHGyx3paOj6lF9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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