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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98971063b495f5339025a7f7e836154c4607cf7a96ea13d782f91529521f00e' 
  AND token = 'PGtE9/bQ2cok4+TnlE+mckX2Z7kZ3Jde+i9/RpsczBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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