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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fddb84be555d0cbeaeb538c1b6ce754eeaee539fff9f1ca72067ec5cf47c0c0' 
  AND token = 'g2jRmQIsPTVH/8u8JT4+7iCUI8X/Hse/ijdDSdli65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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