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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab585640f640c802cd9d2df90cfce5ad59bb4b1e03eea029ac246d8a928c413' 
  AND token = 'lEjLX4GaS/rOhwdQmuPxvypmyTxbIHUDwNbrsUQb7I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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