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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a34befed31eaec56e0ef63bec182ccf594637f35e2184203f4e4002330ad86' 
  AND token = 'arVfcqTPu4HApXrMotcYyHDph8Hg6cYEPoIUej+w3pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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