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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3123b66a55d2ed2c0d8d6a179ca02ebdb7196fe4c000bdc75f14d601d76bb512' 
  AND token = 'fQNEOQXU5bC5EtQECaICJpFGVp8ADX8pmzXFM7NkPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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