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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311bd4bc30a4d2840a28cfffd27a45bd808e27aa18c3c6aa40dd9f85b740bb27' 
  AND token = 'DhTqzITvhMKnr/0rASBKhApH6S3HiuS/fQXaeP9Vxcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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