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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d6dd7f5e60eb9f9e554116dafe501983d0b3694e909485ea47b5a4e2ed5917' 
  AND token = 'ilCkTA3M/QcEU7wTF5Q6+wFmIXnHK5CGa0IFUYmN3FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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