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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0a496e96b2bfc7de389c610ed7be77e1b46db732f792a4b53564dbdc933e96' 
  AND token = 'KE0G7HN1gJabj9ZM/hCfN28UsmWD8YURGrn/PJemxio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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