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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76adc2becab958e4c68d88aa7030c22cc39eeb6c7212d3092f1b7d9ed7d7a7a5' 
  AND token = 'hF37I9XFM8bat8QD9QUqt7mHbeQTgPpP2v9gDhZ1lhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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