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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527c0f7729cf813cf2b04f5d961f92e321939e14bf6f1cd24a770b0a138ecc7b' 
  AND token = 'PMacAg8iLupuecNxJjwnVh23SfIElbmWxoxkOs2QXHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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