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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0f088901b3439f21077a28a78aef8e3399fc0d7accb152b14ee079df60facd' 
  AND token = 'vR4yD8Yc9Fth52iY5rBnxyQ1FX+hZLL5rHnx/hSgajw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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