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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d17cbdd0c2f59ebc2c0e1fcf468cef7d055736be205f476769a3d8686f002c' 
  AND token = 'S5yUHqrHB083RxTdcdr0RxpiWVY/OsZtXnswLn5PV3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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