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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56ed72372ad0255a6a42e2d159eadc2d55a7a4aac947936e70fe9c8d46eccd5' 
  AND token = 'Yfz9k1NdR08/RhdTqBp70Hr3i3xloj8FsPbHb2/bLnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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