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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d460503373bff1a9cccebb2b5cd72706239e6958bca737914acf1a5e692676f' 
  AND token = 'YMpq84VBH7IbseZWneYeDsG3BcSAK2upXOi0FzvOxlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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