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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd41df7ada4dd64f20cdb8d6f31596784315744d818e9e8ea8427b87b4d7eac7' 
  AND token = '36xRAgExOrtrOHrMPwD7IJvz4OIBWnb21xWmqTG0VUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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