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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941673354af9c995bc2be77c4b8042675f0bc8ecdd6b5079d8b20e6405217196' 
  AND token = 'P+1nSLEfcHbinlMpL88Akw/zrMY89mb1DQlZHOYRF/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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