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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f6ede04c0fb870a7e86daaf84c77e9d3ffc87f2d733f4f56f6a1f0cb7dc5f5' 
  AND token = '6vsURf44YV7QGLK5CF9qrFuOx1pwxIZA9v1WY6hi0Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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