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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f911bad9c6a09bef1975b357d947604c613c40ed38f85d134c8dedddbe2d71f8' 
  AND token = '5N1snPfj8LMUN5aRpV4TKMeHJTUq+XOc53IiyOCdEBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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