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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c99b9b9e021fad547f43f4bedba2bc43927270a076b52a065a0d3d185afdb49' 
  AND token = 'yLfxLWng8awOEwJlblOGwftkf5BLwI0HecSBi43nS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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