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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ea830093e984b006d700f1efc03e37383cf60f3a2cac330f1c6fe99031c6e2' 
  AND token = 'xGOGyE/HtdWdbYszbfsup/43tq/9aEYIrLGDpC9qT3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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