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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dce993415d463cfe5657e1c8ed65b077897e534cb6b145988f81b5811df5cb' 
  AND token = 'LJjpiS0zKmUBWL0JkOim+yqbGOJ9fW5weenMVtg1gUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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