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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3694697b3a66fcc6a1b7ef8e539b420f35b526f7ca4a9cf000855b0cd74db068' 
  AND token = 'WPpLD//qbbKgupGWN4coFrIY2c3op1MN6FYrWyoJYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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