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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3798b2f18a35d7709bee31407db2db9b8eb340d2467f9e4f2b72e6fc344b1047' 
  AND token = 'D9qmEq0ls3f2HyYm0P3TReBYhPr8FmJzJV3tP28ZG0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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