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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0834326fe28010eb55f470ff7ba9c983e96c82e023d2980d53ffcc85e15e8843' 
  AND token = '1hGd7ElkWtyxO53V6gaq3gvrfNBVECsgWPfMPWSrMv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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