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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c857fabd606c7976943fa9d64a01c0ac9f57efce26ed4ced4aad01d85680f596' 
  AND token = '2C+9Xw0l6wRsCx2KxWkqx4guVV0DIp24niL/Ap6188A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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