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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b5c8914ec0602dfc1fc6e1bf58060b5cf6a62e00a7bb74bbf5fab5d8ee73e4' 
  AND token = 'YHaDITSxFpvLH/4tubTxh5J3d4yxE0r/gIHBtihrRoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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