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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bbf5b1f596630fb2d26d9f3116b6c51f5e2d065db2d7fc7b317abb3fe0d034' 
  AND token = 'P3ZrY18CTZC+rj363eoPGgUlQfa744qwHPiiTfRCOg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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