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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a1d5311c388176dbef06582007a21eeacfd01d8a766a60d9eb1bffeb521d7c' 
  AND token = 'CebmVtt40/30pL+DPeg5Fk4SKZXsdCybX3in1T/+klk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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