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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2eebe7ddd75a617c57c5b9d21d05cb336df4178800018874c27717fab5efbd' 
  AND token = 'fWidrsglaZqTr67ctF7hBJ8W85PrdazmmsYQ4sffQ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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