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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c914466f976cd2841d1de6e8966beefad265ad54269338156a47c9fe94021133' 
  AND token = 'lT7DL0xeAsRZd5Aj45nZBbGp3CvsodPa/EWw70A86ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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