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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48318603c6b75de1e7988cf82d6ced1de8dfacb3e04ac39a1158fb5a1659c88' 
  AND token = 'mmpzvVcPCWBNXA2Q+JmLtQ5rx7nuj4qErC2CTwBLmfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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