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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ef2664c830ccde46c7b3eb644cfbea21f7c87036ab64da09ffd9aee82e937e' 
  AND token = 'Vt4JZPcMmUoUpB+1HnZ6BA6OGWF8fkdi62XRBYjB62k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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