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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1383417ab5daae6814e7b5e084de53cf94053066dc0ee7437b0258023e01ec9c' 
  AND token = 'xBBmUmfGTh8TBGJ6bCfD2pKpbG/MiQZyKsjoalGB2C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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