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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e881021a377b0691ec123c236d854e606ab2e113fab2910fa913c1cdc9f68' 
  AND token = 'pny2T6h8N7LyeGbQbrjmTA+OW8f2iiqlpShIsAAte5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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