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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2eeb9d6848f4d1a47ee41e5eeb79345d39296fa48084e072e6d452cfe58e31b' 
  AND token = 'VL74p/tg80+jY3nsfCHbGiWsc3qb1tJU8AfIJOdyB8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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