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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d2c4efc148db50b9ec97ad7a10de732d871183712eead8edeb4cbf6d41593' 
  AND token = 'l9/SNDrf1AGDGCcWF+h4Q3WZd1ho3TaRddkbrrmjeu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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