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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167df1ec043e4e1a50275ca968f1fc9fcdd3e2d98277b29b8def8f8b72d21e66' 
  AND token = 'bboilIV6v8x2obXRB9ukC/fimpVovzccLpp0MTQYQ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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