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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4fc0919dd68fe93f75d4518c4d3a160e6cf017d9394fa7b085521f8e490b25' 
  AND token = '9yIPRztGeeWScLifpe4Wx1Utch9u4WLu88kyU56CxLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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