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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6fb62af4a3f4a3e80e9be049da359c2ae5c1a54a74288788cbd3cc308dcdcf' 
  AND token = 'EN1EUWQUAVf2VBmxxW9GpW6gTUg9iEPGr5bDCSCiLvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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