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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84acec82e3fa296f5c8b0575e04ba7b9e1e3a77502da701d2501257a6afae4bb' 
  AND token = 'p82JK9ppE5WUkG4w7eHN+uCI1fLEpG9sOnBdNUdCEt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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