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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48c9c2f72ea7e4e80599aadb49e7a7fed049f2286469fd58eb2c06241c59a76' 
  AND token = 'aT408pB80PifimoO1GhQ911or51T9v5O+Oe9TrAwAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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