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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599a798b3a1061d9dc1a2fdc900fa0b04b226bd7ab2cb8112158e17b995590e4' 
  AND token = 'kq8nSBoJFr7pTK1NzLWyKUg0HcObBz9vrAwTvgGlasc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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