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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee5c6bd7e7d04ecda836ae2b1b2a6bad6390e74748bd88d4bcd16d98f0bffac' 
  AND token = '4dzjj/7QS2MIu6qw6ShPAvREv5szCiK6ZWaoejkzeqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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