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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0822d2539b06416e0652c410073e9738222b1a7c272a2675be822438e8aec715' 
  AND token = 'rReItMc2yqTnwFcojus5s/Efxj/gQbKN4R6OVtbFk4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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